- Ecology: Good
- Chemical: Unknown
WFD classification · ES018MSPFES200MAR001770
Rules at a glance
- Public water
- Licence required
Water temperature for Brown Trout
Warm — slow17°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Hatch timeline · todayPeak at 6am
Hatch predictions
See the full hour-by-hour hatch timeline with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
1
Trout seasonSeason
1
2
2
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Beats · 6
Brieves · 1.3 kmSorteo
Sorteo stretch — 100 m aguas abajo de la presa de Brieves to Pasarela de Luisín.
Beat detail
Sorteo (lottery) permit required
Upstream: 100 m aguas abajo de la presa de Brieves
Downstream: Pasarela de Luisín
Trevías · 0.8 kmSorteo
Sorteo stretch — Pasarela de Luisín to Cola del pozo de la Morena.
Beat detail
Sorteo (lottery) permit required
Upstream: Pasarela de Luisín
Downstream: Cola del pozo de la Morena
Cortina · 2.2 kmFree Tue/Wed/Sat
Free Tue/Wed/Sat stretch — 25 m aguas arriba de la cabecera del pozo el Campón to Banzao de Villar.
Beat detail
Free on Tue/Wed/Sat, sorteo on other days
Upstream: 25 m aguas arriba de la cabecera del pozo el Campón
Downstream: Banzao de Villar
Chamberí · 1.8 kmSorteo
Sorteo stretch — Banzao de Villar to Puente de Chamberí.
Beat detail
Sorteo (lottery) permit required
Upstream: Banzao de Villar
Downstream: Puente de Chamberí
Piedra Blanca · 1.5 kmSorteo
Sorteo stretch — 50 m aguas abajo de la presa de Casielles to Puente de Canero.
Beat detail
Sorteo (lottery) permit required
Upstream: 50 m aguas abajo de la presa de Casielles
Downstream: Puente de Canero
Agüera · 1.8 kmTrout permit
Trout permit stretch — 50 m aguas abajo del Banzao de Electra del Esva to 50 m aguas abajo Puente Bustiello.
Beat detail
Daily permit required, keep within bag limits
Upstream: 50 m aguas abajo del Banzao de Electra del Esva
Downstream: 50 m aguas abajo Puente Bustiello
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
- Asturian fishing licence required
- In 2026 many trout waters run to 15 August, but salmon zones, mountain zones, tramos sin muerte, and border stretches can differ
- Check local coto and tramo rules before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 5
Río Esva in the Hoces gorge 
Río Esva at Agüera 
Footbridge over the Río Esva 
Old weir on the Río Esva Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity40 × 12%4.8
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout Third Sunday of March → 15 August
4 zones — different rules apply
- Coto salmonero
Main Esva salmon beats: Brieves, Trevías, Chamberí, Piedra Blanca (all salmonero tradicional)
- Salmon: Third Saturday of April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Third Sunday of May → 15 August
- Coto parcial
Cortina coto parcial — middle Esva
- Salmon: Third Saturday of April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Third Sunday of March → 15 August
- Coto truchero
Esva trout cotos: Agüera, La Central, Paredes, Restiello, La Chanona — upper/middle Esva
- Sea trout: follows Trout
- Trout: Third Sunday of March → 15 August
- Zona libre
Non-coto stretches of the Esva — free-access trout water
- Sea trout: follows Trout
- Trout: Third Sunday of March → 15 August
Sea trout: Variable seasonal (2026) — Western Asturias spate river — reo and salmon on a clean granite-peat system. Sea trout present from June on rising water. Short response time after rain, brief windows. Night fishing restricted per Asturian regional schedule.
Salmon: Heritage only (2026) — Heritage Asturian salmon river — small slate-and-pasture western Asturian river that has historically held salmon but is no longer a viable salmon fishing destination. Listed as 'historic'. Brown trout fishing remains the primary proposition; sea trout interest is modest.
Related guides
Booking & contacts
Río Esva (Canero system)
Water temperature for Brown Trout
Warm — slow17°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Hatch timeline · todayPeak at 6am
Hatch predictions
See the full hour-by-hour hatch timeline with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
1
Trout seasonSeason
1
2
2
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Beats · 6
Brieves · 1.3 kmSorteo
Sorteo stretch — 100 m aguas abajo de la presa de Brieves to Pasarela de Luisín.
Beat detail
Sorteo (lottery) permit required
Upstream: 100 m aguas abajo de la presa de Brieves
Downstream: Pasarela de Luisín
Trevías · 0.8 kmSorteo
Sorteo stretch — Pasarela de Luisín to Cola del pozo de la Morena.
Beat detail
Sorteo (lottery) permit required
Upstream: Pasarela de Luisín
Downstream: Cola del pozo de la Morena
Cortina · 2.2 kmFree Tue/Wed/Sat
Free Tue/Wed/Sat stretch — 25 m aguas arriba de la cabecera del pozo el Campón to Banzao de Villar.
Beat detail
Free on Tue/Wed/Sat, sorteo on other days
Upstream: 25 m aguas arriba de la cabecera del pozo el Campón
Downstream: Banzao de Villar
Chamberí · 1.8 kmSorteo
Sorteo stretch — Banzao de Villar to Puente de Chamberí.
Beat detail
Sorteo (lottery) permit required
Upstream: Banzao de Villar
Downstream: Puente de Chamberí
Piedra Blanca · 1.5 kmSorteo
Sorteo stretch — 50 m aguas abajo de la presa de Casielles to Puente de Canero.
Beat detail
Sorteo (lottery) permit required
Upstream: 50 m aguas abajo de la presa de Casielles
Downstream: Puente de Canero
Agüera · 1.8 kmTrout permit
Trout permit stretch — 50 m aguas abajo del Banzao de Electra del Esva to 50 m aguas abajo Puente Bustiello.
Beat detail
Daily permit required, keep within bag limits
Upstream: 50 m aguas abajo del Banzao de Electra del Esva
Downstream: 50 m aguas abajo Puente Bustiello
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
- Asturian fishing licence required
- In 2026 many trout waters run to 15 August, but salmon zones, mountain zones, tramos sin muerte, and border stretches can differ
- Check local coto and tramo rules before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 5
Río Esva in the Hoces gorge Río Esva at Agüera Footbridge over the Río Esva Old weir on the Río Esva Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ES018MSPFES200MAR001770
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity40 × 12%4.8
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout Third Sunday of March → 15 August
4 zones — different rules apply
- Coto salmonero
Main Esva salmon beats: Brieves, Trevías, Chamberí, Piedra Blanca (all salmonero tradicional)
- Salmon: Third Saturday of April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Third Sunday of May → 15 August
- Coto parcial
Cortina coto parcial — middle Esva
- Salmon: Third Saturday of April → 15 July · 1 per day, 1 per season (kill limit)
- Sea trout: follows Trout
- Trout: Third Sunday of March → 15 August
- Coto truchero
Esva trout cotos: Agüera, La Central, Paredes, Restiello, La Chanona — upper/middle Esva
- Sea trout: follows Trout
- Trout: Third Sunday of March → 15 August
- Zona libre
Non-coto stretches of the Esva — free-access trout water
- Sea trout: follows Trout
- Trout: Third Sunday of March → 15 August
Sea trout: Variable seasonal (2026) — Western Asturias spate river — reo and salmon on a clean granite-peat system. Sea trout present from June on rising water. Short response time after rain, brief windows. Night fishing restricted per Asturian regional schedule.
Salmon: Heritage only (2026) — Heritage Asturian salmon river — small slate-and-pasture western Asturian river that has historically held salmon but is no longer a viable salmon fishing destination. Listed as 'historic'. Brown trout fishing remains the primary proposition; sea trout interest is modest.
Related guides
Booking & contacts